Reaction between methane and chlorine

The Barking Dog

This famous exothermic reaction takes place when a mixture of carbon disulfide with nitrous oxide or alternatively with nitric oxide is ignited. The sound of the explosion in the tube is similar to that of a barking dog.

Displacement of Silver

This displacement reaction has been recorded by time-lapse photography. The sequence that follows was filmed over a 30 minute period.

Formation of ammonium chloride

In this video cotton wool is soaked with a little concentrated ammonia solution. A second wad is similarly treated with concentrated hydrochloric acid solution.

Formation of Plastic Sulfur

Plastic sulfur is not a true Allotrope of sulfur but this unusual form of the element can be made quite easily by melting it and then cooling the liquid rapidly by pouring it into cold water.